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<?php function tester( array &$error ) { $error = [ 'text' => 'nothing found' ]; return true; } $e = null; $error = []; $error[] =& $e; call_user_func( 'tester', $error ); var_dump( $error );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/84v2o
function name:  (null)
number of ops:  11
compiled vars:  !0 = $e, !1 = $error
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    9     0  E >   ASSIGN                                                   !0, null
   10     1        ASSIGN                                                   !1, <array>
   11     2        FETCH_DIM_W                                      $4      !1
          3        ASSIGN_REF                                               $4, !0
   12     4        INIT_FCALL                                               'tester'
          5        SEND_USER                                                !1
          6        DO_FCALL                                      0          
   13     7        INIT_FCALL                                               'var_dump'
          8        SEND_VAR                                                 !1
          9        DO_ICALL                                                 
         10      > RETURN                                                   1

Function tester:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/84v2o
function name:  tester
number of ops:  4
compiled vars:  !0 = $error
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
    4     1        ASSIGN                                                   !0, <array>
    6     2      > RETURN                                                   <true>
    7     3*     > RETURN                                                   null

End of function tester

Generated using Vulcan Logic Dumper, using php 8.0.0


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